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name: duk_to_primitive
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proto: |
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void duk_to_primitive(duk_context *ctx, duk_idx_t index, duk_int_t hint);
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stack: |
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[ ... val! ... ] -> [ ... ToPrimitive(val)! ]
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summary: |
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<p>Replace the object at <code>index</code> with an Ecmascript
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<a href="http://www.ecma-international.org/ecma-262/5.1/#sec-9.1">ToPrimitive()</a>
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coerced value. The <code>hint</code> argument affects coercion of an object into a
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primitive type, and indicates preference for a string (<code>DUK_HINT_STRING</code>),
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a number (<code>DUK_HINT_NUMBER</code>), or neither (<code>DUK_HINT_NONE</code>).
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<code>DUK_HINT_NONE</code> causes a preference to a number, unless the input value
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is a <code>Date</code> instance, in which case a string is preferred (the exact
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coercion behavior is described in the Ecmascript specification). If <code>index</code>
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is invalid, throws an error.</p>
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<p>Custom type coercion:</p>
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<ul>
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<li>Buffer value (plain): keep existing value</li>
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<li>Buffer object: coerces to the underlying plain buffer value</li>
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<li>Pointer value (plain): keep existing value</li>
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<li>Pointer object: coerces to the underlying plain pointer value</li>
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</ul>
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<div include="ref-custom-type-coercion.html" />
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example: |
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duk_to_primitive(ctx, -3, DUK_HINT_NUMBER);
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tags:
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- stack
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introduced: 1.0.0
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